What Is PTSD and What Events Can Cause It?
PTSD (post-traumatic stress disorder) is a mental health condition that develops after exposure to a traumatic event involving actual or threatened death, serious injury, or sexual violence. Symptoms include flashbacks, nightmares, avoidance behaviors, and heightened reactivity. PTSD can follow a single event or repeated trauma. It affects people of all ages and backgrounds, and effective treatment is available.
Understanding PTSD
Post-traumatic stress disorder is not a sign of weakness. It is a recognized psychiatric condition listed in the DSM-5 under Trauma- and Stressor-Related Disorders.
When something terrifying happens, the brain’s stress response activates. Most people feel shaken for days or weeks. Over time, those feelings typically ease.
For some people, the distress does not fade. Memories of the event keep intruding. Sleep becomes difficult. Ordinary situations can feel dangerous. When these symptoms persist beyond one month and significantly disrupt daily life, a diagnosis of PTSD may apply.
PTSD affects an estimated 3.5% of U.S. adults in any given year, according to the National Institute of Mental Health. Lifetime risk is approximately 8.7%.
How PTSD Is Diagnosed
Clinicians use the DSM-5 criteria to diagnose PTSD. Four symptom clusters must all be present, and symptoms must last more than one month.
Criterion A: Trauma Exposure
The person must have experienced one of the following:
- Directly experiencing the traumatic event
- Witnessing the event happen to someone else
- Learning that a traumatic event occurred to a close family member or friend
- Repeated or extreme exposure to distressing details of traumatic events (common in first responders and law enforcement)
Criterion B: Intrusive Symptoms
The person re-experiences the event in unwanted ways. This includes:
- Recurrent, involuntary distressing memories
- Nightmares related to the event
- Flashbacks, where the person feels the trauma is happening again
- Intense psychological distress when reminded of the trauma
- Physical reactions to trauma-related cues, such as a racing heart or sweating
Criterion C: Avoidance
The person actively avoids reminders of the trauma. Avoidance can involve steering clear of certain people, places, situations, or even thoughts and feelings connected to the event.
Criterion D: Negative Changes in Mood and Cognition
This cluster includes persistent negative beliefs about oneself or the world, feelings of blame, emotional numbness, loss of interest in activities, and a sense of being cut off from others.
Criterion E: Changes in Arousal and Reactivity
People with PTSD are often in a state of heightened alert. Symptoms include:
- Irritability or angry outbursts
- Reckless or self-destructive behavior
- Hypervigilance (constantly scanning for threats)
- Exaggerated startle response
- Difficulty concentrating
- Sleep disturbances
All four clusters must cause significant distress or impairment in daily functioning to meet the full diagnostic threshold, as outlined in NCBI’s clinical review of PTSD.
What Events Can Cause PTSD?
Not every difficult experience causes PTSD. The DSM-5 defines trauma as exposure to actual or threatened death, serious injury, or sexual violence. Below are the most common categories.
Combat and Military Trauma
Military service members face direct exposure to life-threatening combat. They may also witness death, injury, or atrocities that leave lasting psychological impact. Veterans have historically been among the most studied populations with PTSD.
Sexual Assault and Rape
Sexual violence is one of the most common causes of PTSD. Survivors often experience intense shame, self-blame, and fear, which can deepen the trauma response and delay help-seeking.
Physical Assault and Domestic Violence
Being physically attacked, robbed at gunpoint, or subjected to ongoing domestic violence can all trigger PTSD. Repeated exposure often produces more complex trauma responses than a single incident.
Childhood Abuse and Neglect
Physical, emotional, or sexual abuse during childhood carries a high risk of PTSD. Early trauma affects brain development and can shape a person’s stress response for years, according to NIMH research on adverse childhood experiences.
Serious Accidents
Car crashes, workplace accidents, and other sudden injuries can cause PTSD. The threat to physical safety and the helplessness of the moment are key contributing factors.
Natural Disasters
Earthquakes, floods, tornadoes, and wildfires expose survivors to destruction, displacement, and the threat of death. Community-level disasters can compound trauma because entire support networks may be affected simultaneously.
Medical Trauma
A life-threatening diagnosis, emergency surgery, or a traumatic childbirth experience can all qualify as traumatic events. ICU stays and experiences of sudden cardiac events are increasingly recognized as PTSD triggers.
Sudden Loss or Traumatic Death
Learning that a loved one died in a violent or sudden way can cause PTSD, even without direct exposure to the event. This type of secondary trauma is sometimes called vicarious trauma.
Occupational Trauma (First Responders, Healthcare Workers)
Firefighters, police officers, paramedics, and emergency room staff face repeated exposure to graphic events. Their professional role does not protect them from psychological harm. Repeated exposure may actually elevate long-term risk.
Why Some People Develop PTSD and Others Do Not
Two people can experience the same event and respond very differently. Several factors influence whether PTSD develops.
Risk factors that increase vulnerability include:
- Prior trauma exposure, especially in childhood
- Pre-existing mental health conditions such as anxiety or depression
- Lack of social support after the event
- High-intensity or prolonged exposure
- Biological factors, including genetics and stress hormone regulation
Protective factors that reduce risk include:
- Strong social connections
- Access to early mental health support
- Healthy coping strategies
- Sense of agency or perceived control during or after the event
PTSD is not a failure to cope. It reflects the brain doing its best to protect you from a perceived ongoing threat.
Recognizing PTSD in Yourself or Someone You Love
PTSD does not always look like obvious distress. Some people become withdrawn. Others appear irritable or angry without a clear cause. Some use alcohol or substances to manage symptoms without recognizing the connection to trauma.
Common signs worth paying attention to include:
- Difficulty sleeping or frequent nightmares
- Startling easily or feeling constantly on edge
- Avoiding people or situations that were not previously a problem
- Feeling emotionally numb or detached from life
- Intrusive thoughts or images about a past event
- Feeling like the trauma is happening again
If these experiences have lasted more than a month and are interfering with your relationships, work, or daily functioning, speaking with a mental health professional is an important next step.
The team at Mental Health & Wellness of Southern Utah provides specialized trauma-informed care. Evidence-based treatments for PTSD include cognitive-behavioral therapy (CBT) and eye movement desensitization and reprocessing (EMDR), both offered through their mental health services.
PTSD Is Treatable
A PTSD diagnosis is not a life sentence. With the right support, many people experience significant relief from symptoms and are able to return to full, meaningful lives.
Therapy is the cornerstone of PTSD treatment. Medication can also help manage specific symptoms. A personalized approach, developed with a qualified clinician, produces the best outcomes.
If you or someone you care about is showing signs of PTSD, reaching out to a licensed provider is the most important first step. Early intervention often leads to better recovery outcomes.
You can learn more about specialized PTSD support at mentalhealthofutah.com/services/ptsd/.
Frequently Asked Questions
Can PTSD develop months or years after a traumatic event?
Yes. Some people experience a delayed-onset presentation of PTSD. Symptoms may not fully emerge until six months or more after the original trauma. This is especially common when a person has suppressed memories or had little time or support to process the event.
Is PTSD the same as being stressed after a traumatic event?
No. Feeling stressed, shaken, or upset after a traumatic experience is a normal response. PTSD is diagnosed when symptoms persist beyond one month, meet specific DSM-5 criteria, and significantly impair functioning. Not everyone who experiences trauma develops PTSD.
Can children develop PTSD?
Yes. Children can develop PTSD after abuse, accidents, natural disasters, or witnessing violence. Symptoms in children may look different from those in adults and can include bedwetting, refusing to talk about the event, or re-enacting the trauma through play.
Does PTSD always involve a single catastrophic event?
No. PTSD can result from repeated or chronic trauma, such as ongoing domestic violence, childhood abuse, or prolonged combat exposure. Complex PTSD (C-PTSD) is a related condition associated with prolonged, repeated trauma and tends to involve additional difficulties with emotional regulation and identity.
What is the difference between PTSD and acute stress disorder?
Acute stress disorder (ASD) occurs within the first month after a traumatic event and shares many symptoms with PTSD, including intrusive memories and avoidance. ASD is diagnosed when symptoms last between three days and one month. If symptoms persist beyond one month, the diagnosis may be reclassified as PTSD.
How is PTSD treated?
PTSD is primarily treated with trauma-focused psychotherapy. Cognitive-behavioral therapy (CBT) and EMDR are the most well-supported approaches. Certain medications, including SSRIs, may also be prescribed to help manage symptoms. A qualified mental health provider will tailor the treatment plan to the individual’s history, symptoms, and goals.
Reviewed by a licensed clinician at Mental Health & Wellness of Southern Utah.
This article is for informational purposes only and does not constitute medical advice. If you are experiencing symptoms of PTSD or another mental health condition, please consult a qualified mental health professional. If you are in crisis, contact the 988 Suicide & Crisis Lifeline by calling or texting 988.